I am a Mobil 1 believer...

That said, they are all good. But at 186K solid on Mobil 1, and many other family vehicles running strong on it, why change. Mobil was one of the only to keep a real, true, fully synthetic formula for the longest time. As Mike said, Pennzoil in more recent times has become a well respected synthetic too. That being said, GM and many other car manufactures use Mobil 1 as factory fill...so they must be doing something right.

 

I'm strictly talking about Pennzoil Platinum. None of the other stuff haha. It's got DEXOS approval too

With that said... I am using a mobil 1 filter lol

 

And here, my filter of choice is BOSCH (funny, how many times I mention not to use BOSCH products for these cars lol). I have ZERO fact behind it, but I "feel" the oil comes out a little cleaner with a BOSCH filter. Purely observation based opinion.

 

Now, I'm gonna state an opinion here, and probably gonna make people boil over with rage.

Don't take a car that's run a bunch of miles and switch it to synthetic, Your asking for leaks. By its nature it's thinner. It will slip through cracks that you never knew you had. The seals and o-rings, gaskets in an older cars were designed for conventional oils. The reactions can/could cause problems. Now if the car started life with synthetics then by all means yes do it. Don't be switching flavors, types or anything. Make a choice and stick with it. All oils are oils, yes but they are not all the same recipe. And please, if you don't have leaks don't switch to the "high-mileage" stuff. That oil is designed to swell seals, gaskets, o-rings. If it ain't leaking then it can't swell to the walls, it will just blow out and guess what, leaks. And it's already swelled so no fixing that without replacing them.

Ok, I'll step down from the soap box now. Please remember this is only an opinion. So you can take it or leave it. It's just the way I feel.